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HelicopterRadio - JR DMSS › JR DSX9 expecting early Dec
12-01-2007 10:09 PM  9 years agoPost 21
simon_t

rrNovice

Herne Bay, Kent, England

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But the free space attenuation is about 35dB greater at 2.4GHz than 35MHz. I guess the lower noise floor to some extent counteracts this though...

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12-02-2007 12:08 AM  9 years agoPost 22
Climax

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West London, United Kingdom

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I’m not particularly worried about the output power, I’ve got a UK spec DX7 that I’m extremely satisfied with in terms of its performance and range.

I’m just trying to understand how the power is measured and how the European regulations are applied in the case of DSSS systems.

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12-02-2007 02:09 AM  9 years agoPost 23
9387ASH

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UK

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Do a google search for EN300-328v1.7.1 and its all there in black & white on how to test & measure.

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12-05-2007 10:44 AM  9 years agoPost 24
pchristy

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Devon, England

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Be a bit careful when reading those regulations!

At a first glance, it appears that DSSM systems - like the Spektrum - are restricted to 10 mW.

However, if you look up the requirements for a FHSS system, you will find that the Spektrum actually meets all them - even though its normally considered a DSSM system.

The designer has used a bit of creative lateral thinking in producing a DSSM system that meets the FHSS specification!

That's why Ofcom in the UK has accepted that the Spektrum sets can use 100 mW. (This is a big and welcome change from the old Post Office days, when anything that wasn't expressly permitted was banned!)

It's also why (I suspect) some mainland European countries are not so enthusiastic. Brussels loves its bureaucracy, and tends to take a dim view of someone playing smart-ass with its beloved regulations.

There is no good reason - at least in our application - why DSSM and FHSS should not be treated identically. If they were, then DSSM would probably have really substantial benefits over FHSS. Its being held back by petty regulation for the sake of it.

I'm certainly not in favour of a free-for-all on the airwaves, but I have no time for regulation for its own sake!

--
Pete

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12-05-2007 11:24 AM  9 years agoPost 25
9387ASH

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UK

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??

Pete, if you get the opportunity can you give us a call or better still next time you are in the vicinity can you pop in to explain ??

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12-05-2007 11:42 AM  9 years agoPost 26
Climax

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West London, United Kingdom

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Another interesting point that I hadn’t realised until recently is that Futaba’s FAAST is also essentially DSSS but they hop the "spread component" about within the ISM band and is thus marketed as FHSS!

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12-05-2007 11:54 AM  9 years agoPost 27
Climax

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West London, United Kingdom

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Is this the trick?

I know that Spektrum don’t simultaneously their two DSSS signals (i.e. on each of the two channels chosen from the 80 available). So as it’s time multiplexed it essentially frequency hops! etc. etc.

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12-05-2007 12:11 PM  9 years agoPost 28
Four Stroker

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Atlanta

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I share Mac_Man's incredulity and assume this is just more PBBS.

If you first meet the requirements for a DSSS system, you can of course hop whenever you please. Most real systems are HYBRID. Don't believe everything you read in archaic white papers you find on the internet.

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12-19-2007 10:12 PM  9 years agoPost 29
Alican

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Hamburg, Germany

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Any new informations about the JR DSX9??

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12-19-2007 11:53 PM  9 years agoPost 30
9387ASH

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UK

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Not as yet.....

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01-06-2008 03:07 PM  9 years agoPost 31
Alican

rrApprentice

Hamburg, Germany

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Hi guys,

Rotorhobby updatet their page. Look here: http://shop.rotor.com.sg/show-detail.asp?prodid={02A16F14-7AEC-47DA-8159-7E01B02894FF}

But I cant find anywhere information about the stock level

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01-06-2008 04:44 PM  9 years agoPost 32
pchristy

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Devon, England

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Well, since the shop you refer to is in Singapore, and since we know that the DSX9 is still working its way through the European type approval process, I would have thought the chances of any of their stock being legal in Europe is approximately - er - ZERO!

--
Pete

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01-06-2008 06:20 PM  9 years agoPost 33
Alican

rrApprentice

Hamburg, Germany

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Hi Pete,

you mean that the DSX 9 won´t be legal in germany? Sorry my english is not good so I have to ask agein.

..Ali

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01-07-2008 12:56 PM  9 years agoPost 34
pchristy

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Devon, England

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If you buy a DSX9 in Germany (when it eventually becomes available) it will be legal.

If you buy from outside the EU, it probably won't be. The chances are that the shop in Singapore is selling American spec units, which most certainly are NOT legal in Europe!

Even within Europe, different countries are interpreting the rules differently - France for example!

The only way to be absolutely sure is to buy in your own country!

--
Pete

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01-07-2008 01:46 PM  9 years agoPost 35
Alican

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Hamburg, Germany

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Hi Pete,

thanks for the advice. But won´t come an UK version? Because the UK version is also allowed in germany.

Ali

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01-07-2008 02:12 PM  9 years agoPost 36
pchristy

rrApprentice

Devon, England

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MacMan can probably give you a better update than me, but I understand the JR 2.4 GHz should be available in a month or so. Its undergoing type approval now, so hopefully we'll see them by March.

If it is legal in the UK, it *should* be OK in Germany, but I know there was some question over Spektrum units in Germany. The British regulators seem to be taking an enlightened view over new technology, and don't want to stand in its way. Others may be less tolerant!

As I say, the only way to be absolutely sure is to buy in your own country, but if you buy from the UK, it *should* be acceptable in Germany. (I'm no expert on the German regulations!)

--
Pete

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01-07-2008 02:26 PM  9 years agoPost 37
Heliguychris

rrKey Veteran

Perth, West Australia

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We have a bit of discusion in AUS here at the moment, on locally legal 2.4gig radios. Its prolly a dumb question, but do ya know if the "C E" marking means anything. What i mean is, its not just marked on the rx and tx, but they have it advertised on the site as such. Does that cover your butt, legally i mean?
Cheers m8, CHRIS.
http://shop.rotor.com.sg/show-detail.asp?prodid={02A16F14-7AEC-47DA-8159-7E01B02894FF}

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01-07-2008 03:00 PM  9 years agoPost 38
9387ASH

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UK

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As far as I was aware, in the Land of Oz, you were allowed either FCC or CE accredited equipment ?

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01-08-2008 09:48 AM  9 years agoPost 39
9387ASH

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UK

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Pete, its also a case of how you interpret the wording of EN300-328. It may meet the UK's OFCOM interpretation yet in Germany etc, they may interpret the wording differently and impose the tighter limit.

Time will tell.

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01-08-2008 02:40 PM  9 years agoPost 40
pchristy

rrApprentice

Devon, England

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Mac_Man,

Yes, which is why I stressed the *should* in my reply!

As Ive said, the only way to be absolutely sure is to purchase in your own country!

--
Pete

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